Screw anchor



FIG. 1 is a perspective view of a screw anchor;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof, the rear view being a mirror image thereof;

FIG. 4 is a left-side view thereof, the right-side view being a mirror image thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a detailed, cross-sectional view thereof; and,

FIG. 8 is an environmental view thereof.

The broken lines in the drawings illustrate portions of a screw anchor which form no part of the claimed design.

Some aspects of the screw anchor are shown with symbolic breaks in height. The appearance of any portion of the screw anchor between the break lines forms no part of the claimed design. 

CLAIM The ornamental design for a screw anchor, as shown and described. 